The universe implodes, and then another big bang occurs, wiping out all memory of their existence. Of course, there are some undesirable side effects to this, such as the rest of the universe going, "What the..." just before winking out of existence, but this was judged to be insignificant compared to the benefit of a clean-sheet approach to existence.
Seriously, though, the answers to your questions are found in reading the GPL itself, and that link you see above your message here, "phpBB.com Board-Wide Rules and Regulations". No copyright means no support.
The abuse will continue until morale improves!